// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "base/power_monitor/power_monitor_source.h"

#include "base/power_monitor/power_monitor.h"

namespace base {

PowerMonitorSource::PowerMonitorSource()
    : on_battery_power_(false)
    , suspended_(false)
{
}

PowerMonitorSource::~PowerMonitorSource()
{
}

bool PowerMonitorSource::IsOnBatteryPower()
{
    AutoLock auto_lock(battery_lock_);
    return on_battery_power_;
}

void PowerMonitorSource::ProcessPowerEvent(PowerEvent event_id)
{
    PowerMonitor* monitor = PowerMonitor::Get();
    if (!monitor)
        return;

    PowerMonitorSource* source = monitor->Source();

    // Suppress duplicate notifications.  Some platforms may
    // send multiple notifications of the same event.
    switch (event_id) {
    case POWER_STATE_EVENT: {
        bool new_on_battery_power = source->IsOnBatteryPowerImpl();
        bool changed = false;

        {
            AutoLock auto_lock(source->battery_lock_);
            if (source->on_battery_power_ != new_on_battery_power) {
                changed = true;
                source->on_battery_power_ = new_on_battery_power;
            }
        }

        if (changed)
            monitor->NotifyPowerStateChange(new_on_battery_power);
    } break;
    case RESUME_EVENT:
        if (source->suspended_) {
            source->suspended_ = false;
            monitor->NotifyResume();
        }
        break;
    case SUSPEND_EVENT:
        if (!source->suspended_) {
            source->suspended_ = true;
            monitor->NotifySuspend();
        }
        break;
    }
}

} // namespace base
